| 摘要 |
The invention relates to a power transmission mechanism between an engine starting device and an engine. A side surface shape of a lever-shaped engaging and disengaging member (107) in a side facing to a ratchet wheel (120)of a rotation driven portion is formed in a concave shape concaved in a direction away from the wheel (120). The lever-shaped engaging and disengaging member (107) is engaged with and disengaged from a centrifugal clutch mechanism of the engine engaging with and disengaging from the ratchet wheel (120). A first engaging and disengaging lever (141) is engaged with the ratchet wheel (120), a sufficient force to start the engine is accumulated in a force accumulating power spring (131), thereafter the engagement of the first engaging and disengaging member (141) is disconnected by a manual operation, and the ratchet wheel (120) is rapidly rotated by releasing the accumulated force in the force accumulating power spring (131). When the ratchet wheel (120) starts rotating at this time, a stop position of the lever-shaped engaging and disengaging member (107) is not determined, and it is often the case that the lever-shaped engaging and disengaging member (107) and the rapidly rotating ratchet wheel (120) are not originally in the engaged state. As a result, leading ends of the engagement surfaces come into collision with each other so as to be broken, and it is hard to start the engine. However, the lever-shaped engaging and disengaging member (107) is not broken on the basis of the shape and the structure peculiar to the invention, and it is possible to securely start the engine regardless of the stop position thereof and an abrasion of the first engaging and disengaging lever (141). |
